To OP's question, there are attempts with different guilds and raid groups on both factions looking to clear HM/NiM content. I've been on BC since the server merges from Lord Ieldis, and have been raiding legitimately with various different groups in intervals (took several breaks from the game due to RL and gasp, other games) clearing content on level (like NiM Kephess and Brontes). And yes, while pub side has witness a decline in raiders since 3.0, there are potential new raiders and groups who strives to do harder content outside of SM ops and HM EV/KP. As for pvp, I can not answer your question on it, since I've stopped pvping consistently since the announcements of the end of ranked warzones.
Also, Avalauren and Imslash, your responses aren't helping to OP's question. Nitpicking and twisting people's arguments and poisoning potential raiders on BC isn't the way to go to foster a healthy NiM-ready raiding community on both factions.